Evolution of Luminescence with Shell＇s Thickness in Colloidal CdSe/CdS Core/Shell Quantum Dots  

作　　者：梁大顺 沈里 王志兵 崔一平 张家雨 叶永红 

机构地区：[1]Advanced Photonics Center, Southeast University, Nanjing 210096 [2]Department of Physics, Nanjing Normal University, Nanjing 210097

出　　处：《Chinese Physics Letters》2008年第12期4431-4434,共4页中国物理快报（英文版）

基　　金：Support the National Natural Science Foundation of China under Grant Nos 60778041 and 10774023, and the Natural Science Foundation of Jiangsu Province BK2006089.

摘　　要：We synthesize colloidal CdSe/CdS core/shell quantum dots with different shell thicknesses, and there are five samples including CdSe core dots, and CdSe/CdS core/shell dots with 1-4 CdS layers. X-ray diffraction and Raman measurements indicate that the stress in CdSe core becomes stronger with the increasing shell thickness, and the optical measurements show that when the shell becomes thicker, the photolumineseence quantum yield is enhanced, and the radiative decay is also expedited. The temperature-dependent optical spectra are measured. The relation between the microstrueture and the optical properties is discussed.We synthesize colloidal CdSe/CdS core/shell quantum dots with different shell thicknesses, and there are five samples including CdSe core dots, and CdSe/CdS core/shell dots with 1-4 CdS layers. X-ray diffraction and Raman measurements indicate that the stress in CdSe core becomes stronger with the increasing shell thickness, and the optical measurements show that when the shell becomes thicker, the photolumineseence quantum yield is enhanced, and the radiative decay is also expedited. The temperature-dependent optical spectra are measured. The relation between the microstrueture and the optical properties is discussed.

分 类 号：O413[理学—理论物理]